Archean Aeon -

The (also spelled Archaean ) is a major division of geologic time extending from 4.0 to 2.5 billion years ago (Ga) . It follows the Hadean and precedes the Proterozoic aeon. The name is derived from the Greek word for "beginning," as it represents the earliest substantial part of the Earth's rock record. Geological and Tectonic Environment

: The Earth's crust began to stabilize, forming ancient continental nuclei known as cratons . archean aeon

: Rocks known as TTGs (Tonalite-Trondhjemite-Granodiorite) dominate the Archean record, reflecting unique magmatic processes driven by the Earth's significantly higher internal heat. The (also spelled Archaean ) is a major

During this period, the Earth transitioned from a high-heat "stagnant-lid" or "proto-subduction" state into a more modern style of global plate tectonics. Geological and Tectonic Environment : The Earth's crust

: The Archean Earth was primarily a water world, with much of the early continental crust submerged under oceans deeper than those of today.